Power unit



FIG. 1 is a perspective view of a power unit showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a left side elevation view thereof.

The dash-dash broken lines shown represent the portions of the power unit that form no part of the claimed design.

The dash-dot broken lines shown represent the bounds of the claimed design and form no part of the claimed design. 

CLAIM The ornamental design for a power unit, as shown and described. 